[OpenSCAD] for loop in a function

NateTG nate-openscadforum at pedantic.org
Tue Apr 10 20:32:34 EDT 2018

> function sumv(v,i,s=0) = (i==s ? v[i] : v[i] + sumv(v,i-1,s));Depending on
the application, you might want something like:
function sumv(list,start,end) =  start>=end?     0  :    
so that it terminates on bad input.  Of course that version doesn't take
advantage of the overloading on + the way that the one above does.

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